#include "crc32.h"
#include <stdlib.h>
#include <stdint.h>
#include "file_util.h"
#include "options.h"

namespace zoe {
namespace crc32_internal {
// CRC-32 table for the following polynominal:
// X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X+1
uint32_t crc32tab[] = {
    0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL, 0x076DC419L, 0x706AF48FL, 0xE963A535L,
    0x9E6495A3L, 0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L, 0x09B64C2BL, 0x7EB17CBDL,
    0xE7B82D07L, 0x90BF1D91L, 0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL, 0x1ADAD47DL,
    0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L, 0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
    0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L, 0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L,
    0xA2677172L, 0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL, 0x35B5A8FAL, 0x42B2986CL,
    0xDBBBC9D6L, 0xACBCF940L, 0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L, 0x26D930ACL,
    0x51DE003AL, 0xC8D75180L, 0xBFD06116L, 0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
    0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L, 0x2F6F7C87L, 0x58684C11L, 0xC1611DABL,
    0xB6662D3DL, 0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL, 0x71B18589L, 0x06B6B51FL,
    0x9FBFE4A5L, 0xE8B8D433L, 0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L, 0x7F6A0DBBL,
    0x086D3D2DL, 0x91646C97L, 0xE6635C01L, 0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
    0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L, 0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL,
    0xFCB9887CL, 0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L, 0x4DB26158L, 0x3AB551CEL,
    0xA3BC0074L, 0xD4BB30E2L, 0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL, 0x4369E96AL,
    0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L, 0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
    0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L, 0x5768B525L, 0x206F85B3L, 0xB966D409L,
    0xCE61E49FL, 0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L, 0x59B33D17L, 0x2EB40D81L,
    0xB7BD5C3BL, 0xC0BA6CADL, 0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL, 0xEAD54739L,
    0x9DD277AFL, 0x04DB2615L, 0x73DC1683L, 0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
    0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L, 0xF00F9344L, 0x8708A3D2L, 0x1E01F268L,
    0x6906C2FEL, 0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L, 0xFED41B76L, 0x89D32BE0L,
    0x10DA7A5AL, 0x67DD4ACCL, 0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L, 0xD6D6A3E8L,
    0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L, 0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
    0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L, 0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL,
    0x4669BE79L, 0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L, 0xCC0C7795L, 0xBB0B4703L,
    0x220216B9L, 0x5505262FL, 0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L, 0xC2D7FFA7L,
    0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL, 0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
    0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L, 0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL,
    0x0CB61B38L, 0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L, 0x86D3D2D4L, 0xF1D4E242L,
    0x68DDB3F8L, 0x1FDA836EL, 0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L, 0x88085AE6L,
    0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL, 0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
    0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L, 0xA7672661L, 0xD06016F7L, 0x4969474DL,
    0x3E6E77DBL, 0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L, 0xA9BCAE53L, 0xDEBB9EC5L,
    0x47B2CF7FL, 0x30B5FFE9L, 0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L, 0xBAD03605L,
    0xCDD70693L, 0x54DE5729L, 0x23D967BFL, 0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
    0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL};

void crc32Init(uint32_t* pCrc32) {
  *pCrc32 = 0xFFFFFFFF;
}

void crc32Update(uint32_t* pCrc32, unsigned char* pData, uint32_t uSize) {
  uint32_t i = 0;

  for (i = 0; i < uSize; i++)
    *pCrc32 = ((*pCrc32) >> 8) ^ crc32tab[(pData[i]) ^ ((*pCrc32) & 0x000000FF)];
}

// Make the final adjustment
void crc32Finish(uint32_t* pCrc32) {
  *pCrc32 = ~(*pCrc32);
}
}  // namespace crc32_internal

ZoeResult CalculateFileCRC32(const utf8string& file_path, Options* opt, utf8string& str_hash) {
  FILE* f = FileUtil::Open(file_path, "rb");
  if (!f)
    return ZoeResult::CALCULATE_HASH_FAILED;

  uint32_t ulCRC32 = 0;
  crc32_internal::crc32Init(&ulCRC32);

  size_t dwReadBytes = 0;
  unsigned char szData[1024] = {0};

  while ((dwReadBytes = fread(szData, 1, 1024, f)) > 0) {
    if (opt && (opt->internal_stop_event.isSetted() || (opt->user_stop_event && opt->user_stop_event->isSetted()))) {
      fclose(f);
      return ZoeResult::CANCELED;
    }
    crc32_internal::crc32Update(&ulCRC32, szData, dwReadBytes);
  }
  fclose(f);

  crc32_internal::crc32Finish(&ulCRC32);

  char szCRC[10] = {0};
  snprintf(szCRC, sizeof(szCRC), "%08x", ulCRC32);
  str_hash = szCRC;
  return ZoeResult::SUCCESSED;
}

ZoeResult CalculateFileCRC32(FILE* f, Options* opt, utf8string& str_hash) {
  if (!f)
    return ZoeResult::CALCULATE_HASH_FAILED;

  FileUtil::Seek(f, 0L, SEEK_SET);

  uint32_t ulCRC32 = 0;
  crc32_internal::crc32Init(&ulCRC32);

  size_t dwReadBytes = 0;
  unsigned char szData[1024] = {0};

  while ((dwReadBytes = fread(szData, 1, 1024, f)) > 0) {
    if (opt && (opt->internal_stop_event.isSetted() ||
                (opt->user_stop_event && opt->user_stop_event->isSetted()))) {
      return ZoeResult::CANCELED;
    }
    crc32_internal::crc32Update(&ulCRC32, szData, dwReadBytes);
  }

  crc32_internal::crc32Finish(&ulCRC32);

  char szCRC[10] = {0};
  snprintf(szCRC, sizeof(szCRC), "%08x", ulCRC32);
  str_hash = szCRC;
  return ZoeResult::SUCCESSED;
}
}  // namespace zoe